Biotin-PEG3-SS-azide is useful for introducing a biotin moiety to alkyne-containing biomolecules using Click Chemistry. The hydrophilic spacer arm improves the solubility of the labeled molecules in aqueous media. Dde protecting group allows efficient release of captured biotinylated molecules from streptavidin/avidin under mild conditions with hydrazine.
Axispharm offers 3000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.